Press the 'Open' button on the bottom of your nav. Do you have a cassette or two (disc) slots for the nav? If you have a cassette deck, then your nav ECU is located in the cargo area. You will have to remove the passenger side cargo area panel to get access to the ECU. If you have two slots (and your nav is like my Camry's) the bottom slot with the eject button is for the map DVD. I don't know what upgrade process is involved other than swapping discs, but I had my Camry's DVD replaced during a service campaign by Toyota. The dealer did hold onto the car for about an hour.
You can try
TIS, but you will need have a subscriptioin.
Linear Mode
